Datasheet

1
FEATURES
DESCRIPTION
APPLICATIONS
V
ID
ReceiverOutputHigh
ReceiverOutputLow
–0.2V
–0.15V
–0.1V
–
0.05V
0
0.05V
0.1V
0.15V
0.2V
V (TYP)
IT–
V (TYP)
IT+
R
D
B
A
Z
Y
7
8
6
5
2
3
DP
(TOP VIEW)
ACKAGE
1
2
3
4
8
7
6
5
R
D
V
CC
B
A
Z
Y
GND
SN65HVD379
www.ti.com .................................................................................................................................................... SLLS667B – FEBRUARY 2006 – REVISED JUNE 2008
3.3 V FULL-DUPLEX RS-485/RS-422 DRIVERS AND BALANCED RECEIVERS
• Designed for INTERBUS Applications
• Designed for RS-422 and RS-485 Networks
The SN65HVD379 is a differential line driver and
differential-input line receiver that operates with a
• Balanced Receiver Thresholds
3.3-V power supply. Each driver and receiver has
• 1/2 Unit-Load (up to 64 nodes on the bus)
separate input and output pins for full-duplex bus
• Bus-Pin ESD Protection 15 kV HBM
communication designs. They are designed for
balanced transmission lines and interoperation with
• Bus-Fault Protection of – 7 V to 12 V
ANSI TIA/EIA-485A, TIA/EIA-422-B, ITU-T v.11, and
• Thermal Shutdown Protection
ISO 8482:1993 standard-compliant devices.
• Power-Up/Down Glitch-free Bus Inputs and
These differential bus drivers and receivers are
Outputs
monolithic, integrated circuits designed for full-duplex
• High Input Impedance With Low V
CC
bi-directional data communication on multipoint
• Monotonic Outputs During Power Cycling bus-transmission lines at signaling rates
(1)
up to 25
Mbps. The SN65HVD379 is fully enabled with no
• 5-V Tolerant Inputs
external enabling pins.
The 1/2 unit load receiver has a higher receiver input
resistance. This results in lower bus leakage currents
• Digital Motor Control
over the common-mode voltage range, and reduces
• Utility Meters
the total amount of current that an RS-485 driver is
• Chassis-to-Chassis Interconnections
forced to source or sink when transmitting.
• Electronic Security Stations
The balanced differential receiver input threshold
• Industrial, Process, and Building Automation
makes the SN65HVD379 more compatible with
• Point-of-Sale (POS) Terminals and Networks
fieldbus requirements that define an external failsafe
• DTE/DCE Interfaces
structure.
(1) The signaling rate of a line is the number of voltage
transitions that are made per second expressed in the units
bps (bits per second).
BALANCED RECEIVER INPUT THRESHOLDS SN65HVD379
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006 – 2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.